# File:    classes.py
# Author:  Dr. Gibson
# Date:    5/8/2017
# Section: N/A
# E-mail:  k.gibson@umbc.edu 
# Description:
# This file contains python code that uses
# classes and inheritance

# animal class ("parent" class)
class animal:
    # __init__() is the constructor
    def __init__(self, species, name, age):
        self.species = species
        self.name    = name
        self.age     = age

    # __str__() is used when we print() an animal
    def __str__(self):
        msg  = "This " + str(self.species) + " is named " + str(self.name)
        msg += " and is " + str(self.age) + " years old."
        return msg

    # speak() will print out the noise the animal makes
    def speak(self):
        print("\"" + str(self.species) + " noise\"")


# dog inherits everything from animal
# overrides: speak()
# extends  : __init__, __str__
class dog(animal):
    def __init__(self, name, age, breed):
        # calls parent class's constructor
        animal.__init__(self, "dog", name, age)
        # also initializes breed
        self.breed = breed

    def __str__(self):
        # get the result from parent __str__
        msg = animal.__str__(self)
        # add information about the breed
        msg += "\n\tTheir breed is " + str(self.breed)
        return msg

    def speak(self):
        print(str(self.name) + " says boof!")

# cat inherits everything from animal
# overrides:  speak()
# no changes: __init__, __str__
class cat(animal):
    def speak(self):
        print(str(self.name) + " goes meow.")








def main():
    # create an animal object (species: sheep)
    variable1 = animal("sheep", "Dolly", 6)

    # can create objects of class dog and cat
    # can have each animal speak(), and can print() each animal

    # dog's constructor is overridden, and takes in different parameters
    dog1 = dog("True Grit", 50, "Chesapeake Bay Retriever")
    print(dog1)
    dog1.speak()
    print()

    # cat's constructor is NOT overridden, so it's the same as animal's
    cat1 = cat("cat", "Maru", 9)
    print(cat1)
    cat1.speak()
    print()


    

main()